Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments under Operating Leases

Future minimum lease payments under operating leases due each year are as follows at December 31, 2017:

2018	$	1,072
2019		422
2020		412
2021		425
2022		35
Thereafter		—
Total minimum payments	$	2,366